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<h1 class="title">notepad.cpp 示例文件</h1>
<span class="subtitle">tutorials/notepad/notepad.cpp</span>
<!-- $$$tutorials/notepad/notepad.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">

  <span class="comment">/****************************************************************************
  **
  ** Copyright (C) 2017 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the documentation of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
  ** Commercial License Usage
  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
  ** Software or, alternatively, in accordance with the terms contained in
  ** a written agreement between you and The Qt Company. For licensing terms
  ** and conditions see https://www.qt.io/terms-conditions. For further
  ** information use the contact form at https://www.qt.io/contact-us.
  **
  ** BSD License Usage
  ** Alternatively, you may use this file under the terms of the BSD license
  ** as follows:
  **
  ** &quot;Redistribution and use in source and binary forms, with or without
  ** modification, are permitted provided that the following conditions are
  ** met:
  **   * Redistributions of source code must retain the above copyright
  **     notice, this list of conditions and the following disclaimer.
  **   * Redistributions in binary form must reproduce the above copyright
  **     notice, this list of conditions and the following disclaimer in
  **     the documentation and/or other materials provided with the
  **     distribution.
  **   * Neither the name of The Qt Company Ltd nor the names of its
  **     contributors may be used to endorse or promote products derived
  **     from this software without specific prior written permission.
  **
  **
  ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  ** &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.&quot;
  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/</span>

  <span class="preprocessor">#include &lt;QFile&gt;</span>
  <span class="preprocessor">#include &lt;QFileDialog&gt;</span>
  <span class="preprocessor">#include &lt;QTextStream&gt;</span>
  <span class="preprocessor">#include &lt;QMessageBox&gt;</span>
  <span class="preprocessor">#if defined(QT_PRINTSUPPORT_LIB)</span>
  <span class="preprocessor">#include &lt;QtPrintSupport/qtprintsupportglobal.h&gt;</span>
  <span class="preprocessor">#if QT_CONFIG(printer)</span>
  <span class="preprocessor">#if QT_CONFIG(printdialog)</span>
  <span class="preprocessor">#include &lt;QPrintDialog&gt;</span>
  <span class="preprocessor">#endif // QT_CONFIG(printdialog)</span>
  <span class="preprocessor">#include &lt;QPrinter&gt;</span>
  <span class="preprocessor">#endif // QT_CONFIG(printer)</span>
  <span class="preprocessor">#endif // QT_PRINTSUPPORT_LIB</span>
  <span class="preprocessor">#include &lt;QFont&gt;</span>
  <span class="preprocessor">#include &lt;QFontDialog&gt;</span>

  <span class="preprocessor">#include &quot;notepad.h&quot;</span>
  <span class="preprocessor">#include &quot;ui_notepad.h&quot;</span>

  Notepad<span class="operator">::</span>Notepad(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent) :
      <span class="type"><a href="qmainwindow.html">QMainWindow</a></span>(parent)<span class="operator">,</span>
      ui(<span class="keyword">new</span> Ui<span class="operator">::</span>Notepad)
  {
      ui<span class="operator">-</span><span class="operator">&gt;</span>setupUi(<span class="keyword">this</span>);
      <span class="keyword">this</span><span class="operator">-</span><span class="operator">&gt;</span>setCentralWidget(ui<span class="operator">-</span><span class="operator">&gt;</span>textEdit);

      connect(ui<span class="operator">-</span><span class="operator">&gt;</span>actionNew<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>Notepad<span class="operator">::</span>newDocument);
      connect(ui<span class="operator">-</span><span class="operator">&gt;</span>actionOpen<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>Notepad<span class="operator">::</span>open);
      connect(ui<span class="operator">-</span><span class="operator">&gt;</span>actionSave<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>Notepad<span class="operator">::</span>save);
      connect(ui<span class="operator">-</span><span class="operator">&gt;</span>actionSave_as<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>Notepad<span class="operator">::</span>saveAs);
      connect(ui<span class="operator">-</span><span class="operator">&gt;</span>actionPrint<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>Notepad<span class="operator">::</span>print);
      connect(ui<span class="operator">-</span><span class="operator">&gt;</span>actionExit<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>Notepad<span class="operator">::</span>exit);
      connect(ui<span class="operator">-</span><span class="operator">&gt;</span>actionCopy<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>Notepad<span class="operator">::</span>copy);
      connect(ui<span class="operator">-</span><span class="operator">&gt;</span>actionCut<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>Notepad<span class="operator">::</span>cut);
      connect(ui<span class="operator">-</span><span class="operator">&gt;</span>actionPaste<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>Notepad<span class="operator">::</span>paste);
      connect(ui<span class="operator">-</span><span class="operator">&gt;</span>actionUndo<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>Notepad<span class="operator">::</span>undo);
      connect(ui<span class="operator">-</span><span class="operator">&gt;</span>actionRedo<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>Notepad<span class="operator">::</span>redo);
      connect(ui<span class="operator">-</span><span class="operator">&gt;</span>actionFont<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>Notepad<span class="operator">::</span>selectFont);
      connect(ui<span class="operator">-</span><span class="operator">&gt;</span>actionBold<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>Notepad<span class="operator">::</span>setFontBold);
      connect(ui<span class="operator">-</span><span class="operator">&gt;</span>actionUnderline<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>Notepad<span class="operator">::</span>setFontUnderline);
      connect(ui<span class="operator">-</span><span class="operator">&gt;</span>actionItalic<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>Notepad<span class="operator">::</span>setFontItalic);
      connect(ui<span class="operator">-</span><span class="operator">&gt;</span>actionAbout<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>Notepad<span class="operator">::</span>about);

  <span class="comment">// Disable menu actions for unavailable features</span>
  <span class="preprocessor">#if !QT_CONFIG(printer)</span>
      ui<span class="operator">-</span><span class="operator">&gt;</span>actionPrint<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="keyword">false</span>);
  <span class="preprocessor">#endif</span>

  <span class="preprocessor">#if !QT_CONFIG(clipboard)</span>
      ui<span class="operator">-</span><span class="operator">&gt;</span>actionCut<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="keyword">false</span>);
      ui<span class="operator">-</span><span class="operator">&gt;</span>actionCopy<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="keyword">false</span>);
      ui<span class="operator">-</span><span class="operator">&gt;</span>actionPaste<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="keyword">false</span>);
  <span class="preprocessor">#endif</span>
  }

  Notepad<span class="operator">::</span><span class="operator">~</span>Notepad()
  {
      <span class="keyword">delete</span> ui;
  }

  <span class="type">void</span> Notepad<span class="operator">::</span>newDocument()
  {
      currentFile<span class="operator">.</span>clear();
      ui<span class="operator">-</span><span class="operator">&gt;</span>textEdit<span class="operator">-</span><span class="operator">&gt;</span>setText(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>());
  }

  <span class="type">void</span> Notepad<span class="operator">::</span>open()
  {
      <span class="type"><a href="../qtcore/qstring.html">QString</a></span> fileName <span class="operator">=</span> <span class="type"><a href="qfiledialog.html">QFileDialog</a></span><span class="operator">::</span>getOpenFileName(<span class="keyword">this</span><span class="operator">,</span> <span class="string">&quot;Open the file&quot;</span>);
      <span class="type"><a href="../qtcore/qfile.html">QFile</a></span> file(fileName);
      currentFile <span class="operator">=</span> fileName;
      <span class="keyword">if</span> (<span class="operator">!</span>file<span class="operator">.</span>open(<span class="type"><a href="../qtcore/qiodevice.html">QIODevice</a></span><span class="operator">::</span>ReadOnly <span class="operator">|</span> <span class="type"><a href="../qtcore/qfile.html">QFile</a></span><span class="operator">::</span>Text)) {
          <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>warning(<span class="keyword">this</span><span class="operator">,</span> <span class="string">&quot;Warning&quot;</span><span class="operator">,</span> <span class="string">&quot;Cannot open file: &quot;</span> <span class="operator">+</span> file<span class="operator">.</span>errorString());
          <span class="keyword">return</span>;
      }
      setWindowTitle(fileName);
      <span class="type"><a href="../qtcore/qtextstream.html">QTextStream</a></span> in(<span class="operator">&amp;</span>file);
      <span class="type"><a href="../qtcore/qstring.html">QString</a></span> text <span class="operator">=</span> in<span class="operator">.</span>readAll();
      ui<span class="operator">-</span><span class="operator">&gt;</span>textEdit<span class="operator">-</span><span class="operator">&gt;</span>setText(text);
      file<span class="operator">.</span>close();
  }

  <span class="type">void</span> Notepad<span class="operator">::</span>save()
  {
      <span class="type"><a href="../qtcore/qstring.html">QString</a></span> fileName;
      <span class="comment">// If we don't have a filename from before, get one.</span>
      <span class="keyword">if</span> (currentFile<span class="operator">.</span>isEmpty()) {
          fileName <span class="operator">=</span> <span class="type"><a href="qfiledialog.html">QFileDialog</a></span><span class="operator">::</span>getSaveFileName(<span class="keyword">this</span><span class="operator">,</span> <span class="string">&quot;Save&quot;</span>);
          currentFile <span class="operator">=</span> fileName;
      } <span class="keyword">else</span> {
          fileName <span class="operator">=</span> currentFile;
      }
      <span class="type"><a href="../qtcore/qfile.html">QFile</a></span> file(fileName);
      <span class="keyword">if</span> (<span class="operator">!</span>file<span class="operator">.</span>open(<span class="type"><a href="../qtcore/qiodevice.html">QIODevice</a></span><span class="operator">::</span>WriteOnly <span class="operator">|</span> <span class="type"><a href="../qtcore/qfile.html">QFile</a></span><span class="operator">::</span>Text)) {
          <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>warning(<span class="keyword">this</span><span class="operator">,</span> <span class="string">&quot;Warning&quot;</span><span class="operator">,</span> <span class="string">&quot;Cannot save file: &quot;</span> <span class="operator">+</span> file<span class="operator">.</span>errorString());
          <span class="keyword">return</span>;
      }
      setWindowTitle(fileName);
      <span class="type"><a href="../qtcore/qtextstream.html">QTextStream</a></span> out(<span class="operator">&amp;</span>file);
      <span class="type"><a href="../qtcore/qstring.html">QString</a></span> text <span class="operator">=</span> ui<span class="operator">-</span><span class="operator">&gt;</span>textEdit<span class="operator">-</span><span class="operator">&gt;</span>toPlainText();
      out <span class="operator">&lt;</span><span class="operator">&lt;</span> text;
      file<span class="operator">.</span>close();
  }

  <span class="type">void</span> Notepad<span class="operator">::</span>saveAs()
  {
      <span class="type"><a href="../qtcore/qstring.html">QString</a></span> fileName <span class="operator">=</span> <span class="type"><a href="qfiledialog.html">QFileDialog</a></span><span class="operator">::</span>getSaveFileName(<span class="keyword">this</span><span class="operator">,</span> <span class="string">&quot;Save as&quot;</span>);
      <span class="type"><a href="../qtcore/qfile.html">QFile</a></span> file(fileName);

      <span class="keyword">if</span> (<span class="operator">!</span>file<span class="operator">.</span>open(<span class="type"><a href="../qtcore/qfile.html">QFile</a></span><span class="operator">::</span>WriteOnly <span class="operator">|</span> <span class="type"><a href="../qtcore/qfile.html">QFile</a></span><span class="operator">::</span>Text)) {
          <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>warning(<span class="keyword">this</span><span class="operator">,</span> <span class="string">&quot;Warning&quot;</span><span class="operator">,</span> <span class="string">&quot;Cannot save file: &quot;</span> <span class="operator">+</span> file<span class="operator">.</span>errorString());
          <span class="keyword">return</span>;
      }
      currentFile <span class="operator">=</span> fileName;
      setWindowTitle(fileName);
      <span class="type"><a href="../qtcore/qtextstream.html">QTextStream</a></span> out(<span class="operator">&amp;</span>file);
      <span class="type"><a href="../qtcore/qstring.html">QString</a></span> text <span class="operator">=</span> ui<span class="operator">-</span><span class="operator">&gt;</span>textEdit<span class="operator">-</span><span class="operator">&gt;</span>toPlainText();
      out <span class="operator">&lt;</span><span class="operator">&lt;</span> text;
      file<span class="operator">.</span>close();
  }

  <span class="type">void</span> Notepad<span class="operator">::</span>print()
  {
  <span class="preprocessor">#if QT_CONFIG(printer)</span>
      <span class="type">QPrinter</span> printDev;
  <span class="preprocessor">#if QT_CONFIG(printdialog)</span>
      <span class="type">QPrintDialog</span> dialog(<span class="operator">&amp;</span>printDev<span class="operator">,</span> <span class="keyword">this</span>);
      <span class="keyword">if</span> (dialog<span class="operator">.</span>exec() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qdialog.html">QDialog</a></span><span class="operator">::</span>Rejected)
          <span class="keyword">return</span>;
  <span class="preprocessor">#endif // QT_CONFIG(printdialog)</span>
      ui<span class="operator">-</span><span class="operator">&gt;</span>textEdit<span class="operator">-</span><span class="operator">&gt;</span>print(<span class="operator">&amp;</span>printDev);
  <span class="preprocessor">#endif // QT_CONFIG(printer)</span>
  }

  <span class="type">void</span> Notepad<span class="operator">::</span>exit()
  {
      <span class="type"><a href="../qtcore/qcoreapplication.html">QCoreApplication</a></span><span class="operator">::</span>quit();
  }

  <span class="type">void</span> Notepad<span class="operator">::</span>copy()
  {
  <span class="preprocessor">#if QT_CONFIG(clipboard)</span>
      ui<span class="operator">-</span><span class="operator">&gt;</span>textEdit<span class="operator">-</span><span class="operator">&gt;</span>copy();
  <span class="preprocessor">#endif</span>
  }

  <span class="type">void</span> Notepad<span class="operator">::</span>cut()
  {
  <span class="preprocessor">#if QT_CONFIG(clipboard)</span>
      ui<span class="operator">-</span><span class="operator">&gt;</span>textEdit<span class="operator">-</span><span class="operator">&gt;</span>cut();
  <span class="preprocessor">#endif</span>
  }

  <span class="type">void</span> Notepad<span class="operator">::</span>paste()
  {
  <span class="preprocessor">#if QT_CONFIG(clipboard)</span>
      ui<span class="operator">-</span><span class="operator">&gt;</span>textEdit<span class="operator">-</span><span class="operator">&gt;</span>paste();
  <span class="preprocessor">#endif</span>
  }

  <span class="type">void</span> Notepad<span class="operator">::</span>undo()
  {
       ui<span class="operator">-</span><span class="operator">&gt;</span>textEdit<span class="operator">-</span><span class="operator">&gt;</span>undo();
  }

  <span class="type">void</span> Notepad<span class="operator">::</span>redo()
  {
      ui<span class="operator">-</span><span class="operator">&gt;</span>textEdit<span class="operator">-</span><span class="operator">&gt;</span>redo();
  }

  <span class="type">void</span> Notepad<span class="operator">::</span>selectFont()
  {
      bool fontSelected;
      <span class="type"><a href="../qtgui/qfont.html">QFont</a></span> font <span class="operator">=</span> <span class="type"><a href="qfontdialog.html">QFontDialog</a></span><span class="operator">::</span>getFont(<span class="operator">&amp;</span>fontSelected<span class="operator">,</span> <span class="keyword">this</span>);
      <span class="keyword">if</span> (fontSelected)
          ui<span class="operator">-</span><span class="operator">&gt;</span>textEdit<span class="operator">-</span><span class="operator">&gt;</span>setFont(font);
  }

  <span class="type">void</span> Notepad<span class="operator">::</span>setFontUnderline(bool underline)
  {
      ui<span class="operator">-</span><span class="operator">&gt;</span>textEdit<span class="operator">-</span><span class="operator">&gt;</span>setFontUnderline(underline);
  }

  <span class="type">void</span> Notepad<span class="operator">::</span>setFontItalic(bool italic)
  {
      ui<span class="operator">-</span><span class="operator">&gt;</span>textEdit<span class="operator">-</span><span class="operator">&gt;</span>setFontItalic(italic);
  }

  <span class="type">void</span> Notepad<span class="operator">::</span>setFontBold(bool bold)
  {
      bold <span class="operator">?</span> ui<span class="operator">-</span><span class="operator">&gt;</span>textEdit<span class="operator">-</span><span class="operator">&gt;</span>setFontWeight(<span class="type"><a href="../qtgui/qfont.html">QFont</a></span><span class="operator">::</span>Bold) :
             ui<span class="operator">-</span><span class="operator">&gt;</span>textEdit<span class="operator">-</span><span class="operator">&gt;</span>setFontWeight(<span class="type"><a href="../qtgui/qfont.html">QFont</a></span><span class="operator">::</span>Normal);
  }

  <span class="type">void</span> Notepad<span class="operator">::</span>about()
  {
     <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>about(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">&quot;About MDI&quot;</span>)<span class="operator">,</span>
                  tr(<span class="string">&quot;The &lt;b&gt;Notepad&lt;/b&gt; example demonstrates how to code a basic &quot;</span>
                     <span class="string">&quot;text editor using QtWidgets&quot;</span>));

  }

</pre>
</div>
<!-- @@@tutorials/notepad/notepad.cpp -->
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